20. What do scientists use to provide evidence that the earth has a solid inner core and a liquid outer core?
(1 Point)
A) drilling into the mantle
B)seismic wave
C) radar
D)x-rays
21. The layer of the atmosphere closest to the surface of the earth is called the
(1 Point)
A) Stratosphere
B)exosphere
C)mesosphere
D) troposphere

Every compound can be represented by a chemical formula. a chemical formula is the set of symbols showing the elements that make up a compound and their proportions. water’s chemical formula is h 2 2 o. that means a molecule of water contains two atoms of hydrogen and one atom of oxygen chemically bonded. a molecule is a group of two or more atoms bonded together. molecules can range in size from two to thousands of atoms. a molecule of a compound is the smallest unit of that compound. every molecule of water has all the physical and chemical properties of water. that’s because every molecule of water is made of the same elements in the same proportions: two hydrogen atoms and one oxygen! which of the following is a true statement? a every molecule of the same compound will have different properties. b every molecule of a compound has the same proportion of elements. c molecules can be physically separated into smaller units of a compound. d molecules cannot be represented by chemical formulae.

On his trip to the galapagos islands, darwin determined that animals on the islands

In pea plants, yellow seed color is dominated and green seed color is recessive. what will the generations look lik